Primary Unknown Squamous Cell Carcinoma with the Anaplastic Lymphoma Kinase Fusion Gene That Was Effectively Treated with Alectinib: A Case Report. - Kawakado, Keita; Tokumo, Kentaro; Kato, Tasuku; Tsuda, Hirotoki; Fujita, Tomohiro; Ikuta, Yukihiro; Yanagawa, Takashi (Case Reports in Oncology, 2026)